Original Makita tension roller shaft (part no. 323829-0) — direct replacement for the tension roller on Makita 4" belt sanders. It’s the metal shaft that the tension/idler roller rides on; swapping a worn or bent shaft gets your belt tracking and tensioning back to factory behavior so the sander runs smoothly and the belt wears evenly.
Fits Makita model 9403 (the 4" × 24" / 100 × 610 mm belt sander) and is also listed for the related M9400 / MT940 family — the same part is commonly shown as 323829-0 or 3238290. Install replaces the tension roller shaft in the belt/tension assembly.
Built as a durable metal replacement that restores correct belt alignment and tension; sold as a genuine Makita part so it matches the original fit and form used in the factory assembly. Use this when the roller shaft is worn, scored, bent, or causing poor belt tracking.
If you need the exact item for a repair, order by part number 323829-0 (also listed without the dash as 3238290) to ensure you get the correct tension roller shaft for those Makita sander models.
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